A full transit of v2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS

Autor: Ehrenreich, D., Delrez, L., Akinsanmi, B., Wilson, T. G., Bonfanti, A., Beck, M., Benz, W., Hoyer, S., Queloz, D., Alibert, Y., Charnoz, S., Collier Cameron, A., Deline, A., Hooton, M., Lendl, M., Olofsson, G., Sousa, S. G., Adibekyan, V., Alonso, R., Anglada, G., Barrado, D., Barros, S. C. C., Baumjohann, W., Beck, T., Bekkelien, A., Bergomi, M., Billot, N., Bonfils, X., Brandeker, A., Broeg, C., Bárczy, T., Berta-Thompson, Z. K., Cabrera, J., Corral Van Damme, C., Csizmadia, S., Davies, M. B., Deleuil, M., Demangeon, O., Demory, B.-O., Doty, J. P., Erikson, A., Fausnaugh, M. M., Florén, H.-G., Fortier, A., Fossati, L., Fridlund, M., Futyan, D., Gandolfi, D., Gillon, M., Guterman, P., Güdel, M., Heng, K., Isaak, K. G., Jäckel, A., Jenkins, J. M., Kiss, L. L., Laskar, J., Latham, D. W., Lecavelier des Etangs, A., Levine, A. M., Lovis, C., Magrin, D., Maxted, P. F. L., Morgan, E. H., Nascimbeni, V., Osborn, H. P., Ottensamer, R., Pagano, I., Pallé, E., Peter, G., Piotto, G., Pollacco, D., Ragazzoni, R., Rando, N., Rauer, H., Ribas, I., Ricker, G. R., Salmon, S., Santos, N. C., Scandariato, G., Simon, A. E., Smith, A. M. S., Steinberger, M., Steller, M., Szabó, G. M., Ségransan, D., Shporer, A., Tschentscher, M., Thomas, N., Udry, S., Vanderspek, R., Van Grootel, V., Walton, N. A.
Přispěvatelé: Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique du Globe de Paris (IPGP (UMR_7154)), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France, Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy, University of St Andrews. St Andrews Centre for Exoplanet Science
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Ehrenreich, D.; Delrez, L.; Akinsanmi, B.; Wilson, T. G.; Bonfanti, A.; Beck, M.; Benz, W.; Hoyer, S.; Queloz, D.; Alibert, Y.; Charnoz, S.; Collier Cameron, A.; Deline, A.; Hooton, M.; Lendl, M.; Olofsson, G.; Sousa, S. G.; Adibekyan, V.; Alonso, R.; Anglada, G.; ... (2023). A full transit of v 2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS. Astronomy and astrophysics, 671, A154. EDP Sciences 10.1051/0004-6361/202244790
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2023, 671, ⟨10.1051/0004-6361/202244790⟩
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202244790
Popis: The planetary system around the naked-eye star $\nu^2$ Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses. The TESS and CHEOPS missions revealed that all three planets are transiting and have radii straddling the radius gap separating volatile-rich and volatile-poor super-earths. Only a partial transit of planet d had been covered so we re-observed an inferior conjunction of the long-period 8.6 Earth-mass exoplanet $\nu^2$ Lup d with the CHEOPS space telescope. We confirmed its transiting nature by covering its whole 9.1 h transit for the first time. We refined the planet transit ephemeris to P = 107.1361 (+0.0019/-0.0022) days and Tc = 2,459,009.7759 (+0.0101/-0.0096) BJD_TDB, improving by ~40 times on the previously reported transit timing uncertainty. This refined ephemeris will enable further follow-up of this outstanding long-period transiting planet to search for atmospheric signatures or explore the planet's Hill sphere in search for an exomoon. In fact, the CHEOPS observations also cover the transit of a large fraction of the planet's Hill sphere, which is as large as the Earth's, opening the tantalising possibility of catching transiting exomoons. We conducted a search for exomoon signals in this single-epoch light curve but found no conclusive photometric signature of additional transiting bodies larger than Mars. Yet, only a sustained follow-up of $\nu^2$ Lup d transits will warrant a comprehensive search for a moon around this outstanding exoplanet.
Comment: 16 pages, 9 figures. Accepted for publication in Astronomy & Astrophysics
Databáze: OpenAIRE
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